<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> MAR-31-1999 <CASH> 183,141 <SECURITIES> 99,216 <RECEIVABLES> 289,717 <ALLOWANCES> 6,747 <INVENTORY> 171,850 <CURRENT-ASSETS> 844,172 <PP&E> 2,160,938 <DEPRECIATION> 850,018 <TOTAL-ASSETS> 2,647,740 <CURRENT-LIABILITIES> 400,939 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 1,419 <OTHER-SE> 1,424,391 <TOTAL-LIABILITY-AND-EQUITY> 2,647,740 <SALES> 456,837 <TOTAL-REVENUES> 456,837 <CGS> 297,066 <TOTAL-COSTS> 297,066 <OTHER-EXPENSES> 144,412 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> (10,485) <INCOME-PRETAX> 6,502 <INCOME-TAX> 1,630 <INCOME-CONTINUING> 4,872 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> (91,774) <NET-INCOME> (86,902) <EPS-PRIMARY> (0.61) <EPS-DILUTED> (0.60)